The Comedy Central comedian stumped on Saturday for Elizabeth Colbert Busch, one of two Democratic candidates running for the U.S. House seat vacated by now-Sen. Tim Scott, a Republican appointed to fill the Senate spot that Jim DeMint left last month.

Also seeking the seat in the GOP-leaning district are 16 Republicans, the most recognizable among them being former Gov. Mark Sanford. A primary will be held in March ahead of the May special election.

Colbert - the comedian - signed books and mingled at the campaign event in his hometown, held at bowling spot The Alley Charleston.

Colbert has previously teased his own bids for public office, but said in the interview he hoped his career didn't hurt his sister's chances.

"I don't actually have anything to offer people in a public office," he said. "It's natural for her to run because she has skills and something to offer society. I am professionally ridiculous. So I just hope that what I do for a living doesn't sully her good character."